It depends.
If your earnings were for 2 different employers, you may need to amend your federal return to include your wages from both employers.
If your wages were earned under 1 employer, then you may only need to amend your Pennsylvania state return to claim a credit for taxes paid to the other state, if applicable.
If you have already reflected all of your earnings from PA sources and you marked your return as being a part-year resident, it is possible that you do not have to amend your PA return. But be aware, if you end up having to amend your federal return, you will need to amend your PA return.
Make sure you do complete your return for Louisiana though as it sounds like you need to file the tax return for that state.
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